( )设计开始需与其他工种配合，如结构、水、暖、电设备等。
A．方案
B．扩初
C．施工
D．施工图
参考答案：B
计算（C2）n．（Cn+1）2的结果是
A.C4n+4
B.C4n+2
C.C2n+2
D.C3n+4
She was so tired. So she stopped _______. [ ]
A. to have a rest
B. to have rest
C. having a rest
D. having rest
